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该剧是讲述青春男女不惜献上自己人生的全部投身危险的爱情的20岁诱惑罗曼史，以法国小说《危险关系》为雏形而创作。 禹棹焕饰演有着致命眼神的20岁野兽男权施贤，他投身于诱惑恩泰熙的危险游戏。 朴秀荣饰演恩泰熙，她是一个被爱情耍得团团转，认定自己是世界上最可怜的人的20岁“铁壁女”，但和权施贤相遇后，她再次意识到自己一直期待着爱情。 文佳煐饰演20代女性的典范、女CEO、医院院长的女儿崔秀智，因其优雅的背景连艺人都和她做朋友。
Soo Ji, Si Hyun, and Se Joo are best friends who have just graduated from high school. Like their crazy personalities, they do not graduate like normal students. They disclose an affair one of the teachers have been having by airing the footages on a big screen during the graduation ceremony. Meanwhile, Soo Ji’s first love, Lee Ki Young, tells her some hurtful words.
After the graduation, Si Hyun and Se Joo decides to go clubbing while Soo Ji is out with Ki Young. At the club, Si Hyun meets a woman and shares a kiss with her. It is later revealed that Si Hyun has kissed his fellow classmate’s mom. Meanwhile, Soo Ji decides to take revenge on Ki Young and targets Park Hye Jeong and Eun Tae Hee.
Soo Ji's mother and Si Hyun's father make an official announcement about their engagement. Only then, do Soo Ji, Si Hyun, and Se Joo find out about the adults' relationship. Ki Young, Soo Ji's first love, makes snide remarks about the surprise announcement, and Se Joo stands up for her. Meanwhile, the three musketeers try to find a way to stop their parents from getting married.
In order to prove Si Hyun's sincerity towards her, Soo Ji tells him to participate in a game of seduction. Si Hyun agrees to do so without hesitation. Si Hyun tries his best to make Tae Hee like him, but Tae Hee won't budge. Meanwhile, Soo Ji visits her mother's office and pleads her not to get married.
Si Hyun, Soo Ji, and Se Joo discuss how Si Hyun will seduce Tae Hee. Si Hyun tries to make Tae Hee feel like it is fate by purposely running into her often. In addition, he also tries to win Tae Hee's sympathy. However, Tae Hee does not easily waver. Finally, he gets the chance to eat with her, and they seem to bond. At that moment, Tae Hee tells him she does not want to see his face anymore.
Unintentionally, Si Hyun helps Tae Hee out at a nursing home. Tae Hee sees a soft and generous side to him that she never knew about, and her heart sof-tens. On their way back home, she tells him that she will not date him, and Si Hyun asks if she dislikes him that much. Meanwhile, Si Hyun feels a strange emotion toward Tae Hee.
Si Hyun and Tae Hee begin to bond, and Si Hyun tells her that he is afraid of hurting her. Tae Hee begins to have strange feelings toward him. Meanwhile, Soo Ji accidentally breaks a dish that Si Hyun received from the nursing home. Si Hyun gets very upset at her, and Soo Ji is shocked to see him react that way.
Si Hyun tells Soo Ji that he will stop chasing after Tae Hee. Upon hearing this, Soo Ji is frustrated. Meanwhile, Kwon Seok Woo meets Seol Young Won, Tae Hee's mother. They talk about the past and catch up. Amidst all this, Seok Woo's fiancee and Soo Ji's mother, Myung Mi Ri, is suspicious about him.
Not being able to move into her dorm, Si Hyun gets Tae Hee a place to stay. Furthermore, the place happens to be across his. Tae Hee has no idea that the owner of the building is Si Hyun himself. Meanwhile, Soo Ji senses that Si Hyun may not be simply putting on an act in front of Tae Hee.
Soo Ji plans to go on a trip with Si Hyun and Se Joo. On top of that, she invites Kyung Joo and Tae Hee as well. Kyung Joo is exhilarated at the fact that she will be spending the night with Se Joo. However, on the day of the trip, Kyung Joo's mom falls sick, and she is forced to send Tae Hee first. Si Hyun hears about this and goes to pick Tae Hee up.
During the trip, Si Hyun takes Soo Ji's side and acts coldly toward Tae Hee. Tae Hee is surprised to see him act this way since he has always been warm toward her when they were together. Si Hyun apologizes, and the two reconcile. However, Soo Ji finds her and tells her a lie. She lies that Si Hyun and herself are actually in love with each other and that Si Hyun's only acting this way toward Tae Hee in order to hide it.
After hearing what Soo Ji said, Tae Hee is more and more disappointed at Si Hyun. However, she can't help but think about him. On days when he is not around, she misses him. While talking on the phone with her dad, Tae Hee realizes that although she has confessed her feelings to Si Hyun, he has never replied back. Heartbroken, she decides to end their relationship.
Believing that she has been the only one with feelings in their relationship, Tae Hee tells Si Hyun that she wants to end it with him. Si Hyun cannot reply, but he knows that he is falling for her. Broken, Si Hyun gets drunk at a bar, and Soo Ji and Se Joo check up on him. Si Hyun asks Soo Ji what she said to Tae Hee, and she tells him the truth.
Si Hyun confesses his feelings toward Tae Hee, and the two spend the night together at the hospital. The next day, Si Hyun finds out that his credit card is blocked, and Tae Hee pays for his hospital bill. Meanwhile, Seok Woo has trou-ble seeing and goes to the doctor, only to find out that he will go blind in the future.
Soo Ji tells Si Hyun that his dad is seeing some other woman. He demands to know who she is, but Soo Ji does not tell him exactly who she is. Meanwhile, Se Joo and Soo Ji decide to go to a street bar. There, Soo Ji spots Seok Woo and Young Won on a date, having a drink together.
Si Hyun finds Tae Hee living in a pile of mess and not having a balanced diet. He tells her that he will come by to take care of her more often and cleans the house. He also shyly asks her to change her passcode to his number, to which she tells him that it is already his number. Meanwhile, Si Hyun visits Seok Woo and promises that he will find out whom he is seeing.
Si Hyun and Tae Hee go on a trip. There, the two drink makgeolli, a Korean al-coholic beverage, together in broad daylight. Si Hyun is hesitant to try it at first, but Tae Hee urges him. They end up drinking too much, miss the last bus, and decide to spend the night at an old inn. However, Si Hyun doesn't want to go in, and Tae Hee cannot understand why. Meanwhile, Soo Ji realizes that Si Hyun is spending the night out with Tae Hee.
Si Hyun finds out that Tae Hee knew all along that Seok Woo was not his bio-logical father. She apologizes for waiting for him to tell her the truth instead of mentioning it to him first. However, he tells her that he wants to be alone. Meanwhile, Si Hyun has a talk with Young Won without knowing that she is Tae Hee's mother.
Si Hyun invites Tae Hee to a luxurious place where Soo Ji and Se Joo are waiting. In front of them, Si Hyun acts very coldly toward Tae Hee and even tells her that he is completely different from her. Tae Hee asks him whether he does not like her anymore, and Si Hyun lies. While talking with Soo Ji in private, Si Hyun tells her something she has dreaded to hear.
Soo Ji asks Seok Woo to meet her. She tells her about his secret affair with the potter, Seol Young Won. She then tells him to allow her to marry Si Hyun. Seok Woo is flustered that she knows about Young Won but keeps his calm. Meanwhile, after breaking up with Si Hyun, Soo Ji gets drunk at Se Joo's restaurant. Not knowing whom else to call, Se Joo calls Si Hyun.
